diff --git a/src/layouts/schedule/schedule.vue b/src/layouts/schedule/schedule.vue
index 3fd83b2ab..6c0b3506f 100644
--- a/src/layouts/schedule/schedule.vue
+++ b/src/layouts/schedule/schedule.vue
@@ -1798,18 +1798,26 @@ export default {
                     }
 
                     if (this.isShowMobileFirstAppt) {
-                        if (firstMobilePMDate && numberOfDaysToFirstMobilePMDate <= pmMobileDays) {
+                        if (pmMobileDays == 0) {
+                            // Selects the first available time slot
+                            preSelectedMobileAppointment =
+                                numberOfDaysToFirstMobileAMDate < numberOfDaysToFirstMobilePMDate
+                                    ? firstMobileAMAppt
+                                    : firstMobilePMAppt;
+                        } else if (
+                            firstMobilePMDate &&
+                            numberOfDaysToFirstMobilePMDate <= pmMobileDays
+                        ) {
+                            // Selects the first available PM time slot
                             preSelectedMobileAppointment = firstMobilePMAppt;
                         } else if (
-                            (firstMobilePMDate &&
-                                numberOfDaysToFirstMobilePMDate >= noPMMobileDays) ||
-                            pmMobileDays == 0
+                            firstMobilePMDate &&
+                            numberOfDaysToFirstMobilePMDate >= noPMMobileDays
                         ) {
+                            // Selects the first available AM time slot. If none, selects the first available PM time slot
                             preSelectedMobileAppointment = firstMobileAMAppt
                                 ? firstMobileAMAppt
-                                : null;
-                            !preSelectedMobileAppointment &&
-                                (preSelectedMobileAppointment = firstMobilePMAppt);
+                                : firstMobilePMAppt;
                         }
 
                         if (preSelectedMobileAppointment) {